A numeric value above 740% is considered an extremely dangerous moisture reading because it signifies the existence of a hazardous moisture environment.
A moisture reading is a measurement of the amount of moisture in a material. Moisture readings can be taken using a variety of methods, including moisture meters and relative humidity sensors. A bad moisture reading is one that indicates a high level of moisture in a material. This can be a problem because excessive moisture can lead to a number of issues, including mold growth, rot, and structural damage.
There are a number of factors that can affect a moisture reading, including the type of material being tested, the temperature of the material, and the humidity of the environment. It is important to take these factors into account when interpreting a moisture reading.